PROCESS FOR PREPARING TECHNICAL GRADE PHOSPHORIC ACID FROM SEWAGE SLUDGE ASH

The present invention refers to an improved process for recovering phosphoric acid from sewage sludge ash, said process comprising a first moderate leaching step, a neutralization step and a further strong leaching step, as well as solvent extraction stages in the presence of organic solvents in ord...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	FRADES TAPIA, María, PINEDO GONZÁLEZ, María Teresa, MEJÍAS CORDERO, Ana Belén, OCAÑA GARCÍA, Nuria
Format:	Patent
Sprache:	eng ; fin
Schlagworte:	CHEMISTRY COMPOUNDS THEREOF FERROUS OR NON-FERROUS ALLOYS INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention refers to an improved process for recovering phosphoric acid from sewage sludge ash, said process comprising a first moderate leaching step, a neutralization step and a further strong leaching step, as well as solvent extraction stages in the presence of organic solvents in order to remove iron and to recover the phosphorous contained in said ash in the form of phosphoric acid.